Carbon dioxide gas enters a well-insulated diffuser at 20 psia, 500 R, with a velocity of 800 ft/s through a flow area of 1.4 in2. At the exit, the flow area is 30 times the inlet area, and the velocity is 20 ft/s. Assume carbon dioxide is an ideal gas. For a steady-state operation, determine

The inner surface of a 0.25m thick brick wall of a furnace is kept at 810ºc, when the outside surrounding air is at 22ºc. the convective heat transfer coefficient of the outer surface is 12 w/m2k and the thermal conductivity of the brick is 0.865 w/mk.neglect the convective resistance for the inner side of the furnace and assume that the problem is steady state and thermal radiation is neglected. (a)-sketch the system and calculate the rate of heat loss per unit wall area. (b)-calculate the temperature of the outer wall surface.